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FlowParser 0.1

FlowParser is a C Python extenson for reconstructing and dumping IP
flows from either a packet trace or a live capture. It works by
sniffing traffic and keeping track of active flows. Each flow also has
the headers (network and transport layer) of its packets stored. The
flow and its packet headers are made available either on demand or
when the flow terminates.

Use Cases

What could you possibly use another packet sniffer for?

Active monitoring of flows in / out of your machine / network. Ever
wondered what flows are currently active and how much bandwidth they
are using? FlowParser is an easy-to-use lightweight way of finding out.

Looking for anomalies in header fields. FlowParser will let you spot
and record flows that for example have strange variation in TTL.

Quick offline data parsing. If you are looking for a specific flow
or you want to study the behavior of a class of flows in a multi-GB
packet trace FlowParser can help you accomplish the task quickly and
easily.

And lots more. In general the idea is that reconstructing a flow and
looking at the header fields of its packets should be as quick and
painless as a couple of lines of Python.

Simple Example

This simple snippet will start listening to the en0 interface and
every ten seconds will print the five-tuple id of flows that go faster
than 1KB per second: